1. What is Prototype chain ? Mid A. both shallow-copy own enumerable properties; spread {...o} is an expression while Object.assign mutates a target object B. an ES6 class is syntax over JS's prototype-based inheritance, not a separate object model C. the chain of [[Prototype]] links JS walks to resolve a property not found on the object itself D. tests whether a property exists directly on an object rather than being inherited via the prototype chain
2. Which term means: "the chain of [[Prototype]] links JS walks to resolve a property not found on the object itself"? Mid A. Prototype chain B. Object.create C. Spread vs Object.assign D. Object.freeze
3. Which statement is correct? Mid A. Prototype chain — an ES6 class is syntax over JS's prototype-based inheritance, not a separate object model B. Prototype chain — both shallow-copy own enumerable properties; spread {...o} is an expression while Object.assign mutates a target object C. Prototype chain — the chain of [[Prototype]] links JS walks to resolve a property not found on the object itself D. Prototype chain — creates a new object with its prototype set to the object you pass in
4. What is Object.create ? Mid A. an ES6 class is syntax over JS's prototype-based inheritance, not a separate object model B. creates a new object with its prototype set to the object you pass in C. the chain of [[Prototype]] links JS walks to resolve a property not found on the object itself D. tests whether a property exists directly on an object rather than being inherited via the prototype chain
5. Which term means: "creates a new object with its prototype set to the object you pass in"? Mid A. Object.freeze B. hasOwnProperty C. Object.create D. class is sugar
6. Which statement is correct? Mid A. Object.create — the chain of [[Prototype]] links JS walks to resolve a property not found on the object itself B. Object.create — tests whether a property exists directly on an object rather than being inherited via the prototype chain C. Object.create — both shallow-copy own enumerable properties; spread {...o} is an expression while Object.assign mutates a target object D. Object.create — creates a new object with its prototype set to the object you pass in
7. What is hasOwnProperty ? Junior A. creates a new object with its prototype set to the object you pass in B. an ES6 class is syntax over JS's prototype-based inheritance, not a separate object model C. the chain of [[Prototype]] links JS walks to resolve a property not found on the object itself D. tests whether a property exists directly on an object rather than being inherited via the prototype chain
8. Which term means: "tests whether a property exists directly on an object rather than being inherited via the prototype chain"? Junior A. Spread vs Object.assign B. Object.create C. hasOwnProperty D. class is sugar
9. Which statement is correct? Junior A. hasOwnProperty — makes an object immutable at the top level — its own properties cannot be added, deleted, or reassigned B. hasOwnProperty — an ES6 class is syntax over JS's prototype-based inheritance, not a separate object model C. hasOwnProperty — tests whether a property exists directly on an object rather than being inherited via the prototype chain D. hasOwnProperty — both shallow-copy own enumerable properties; spread {...o} is an expression while Object.assign mutates a target object
10. What is class is sugar ? Mid A. makes an object immutable at the top level — its own properties cannot be added, deleted, or reassigned B. the chain of [[Prototype]] links JS walks to resolve a property not found on the object itself C. an ES6 class is syntax over JS's prototype-based inheritance, not a separate object model D. creates a new object with its prototype set to the object you pass in
11. Which term means: "an ES6 class is syntax over JS's prototype-based inheritance, not a separate object model"? Mid A. Object.freeze B. class is sugar C. Spread vs Object.assign D. hasOwnProperty
12. Which statement is correct? Mid A. class is sugar — the chain of [[Prototype]] links JS walks to resolve a property not found on the object itself B. class is sugar — creates a new object with its prototype set to the object you pass in C. class is sugar — tests whether a property exists directly on an object rather than being inherited via the prototype chain D. class is sugar — an ES6 class is syntax over JS's prototype-based inheritance, not a separate object model
13. What is Object.freeze ? Mid A. the chain of [[Prototype]] links JS walks to resolve a property not found on the object itself B. makes an object immutable at the top level — its own properties cannot be added, deleted, or reassigned C. an ES6 class is syntax over JS's prototype-based inheritance, not a separate object model D. tests whether a property exists directly on an object rather than being inherited via the prototype chain
14. Which term means: "makes an object immutable at the top level — its own properties cannot be added, deleted, or reassigned"? Mid A. Object.freeze B. hasOwnProperty C. Object.create D. class is sugar
15. Which statement is correct? Mid A. Object.freeze — both shallow-copy own enumerable properties; spread {...o} is an expression while Object.assign mutates a target object B. Object.freeze — creates a new object with its prototype set to the object you pass in C. Object.freeze — makes an object immutable at the top level — its own properties cannot be added, deleted, or reassigned D. Object.freeze — an ES6 class is syntax over JS's prototype-based inheritance, not a separate object model
16. What is Spread vs Object.assign ? Mid A. creates a new object with its prototype set to the object you pass in B. makes an object immutable at the top level — its own properties cannot be added, deleted, or reassigned C. the chain of [[Prototype]] links JS walks to resolve a property not found on the object itself D. both shallow-copy own enumerable properties; spread {...o} is an expression while Object.assign mutates a target object
17. Which term means: "both shallow-copy own enumerable properties; spread {...o} is an expression while Object.assign mutates a target object"? Mid A. Spread vs Object.assign B. hasOwnProperty C. class is sugar D. Object.create
18. Which statement is correct? Mid A. Spread vs Object.assign — an ES6 class is syntax over JS's prototype-based inheritance, not a separate object model B. Spread vs Object.assign — both shallow-copy own enumerable properties; spread {...o} is an expression while Object.assign mutates a target object C. Spread vs Object.assign — makes an object immutable at the top level — its own properties cannot be added, deleted, or reassigned D. Spread vs Object.assign — creates a new object with its prototype set to the object you pass in